The Craftmans Shop > Radio Control Models
RC F-117A Stealth build
Krown Kustoms:
Thanks Bogs
Well It wasnt a total disaster, this project isnt going to be grounded yet.
I wish I had video of the test flight it was great.
I set the trim with a lot of elevator because I was afraid it would nose in, when I launched it (off the deck) I used full elevator not thinking the trim adjustment.
It immediatly did a loop and then rolled left (battery pack on the left side) I didnt think the pack was too off center but I guess it was.
The thing flies like a dart, by this time it was probably going 40 mph and getting near the trees, so I cut the throttle and it handeled like a boat after you kill the throttle.
It nosed down hard and did a front flip and landed on its top (I have been told it dosent do well without throttle) I guess it acts that way due to not really having lift, more like floating on oncoming air.
I am fixing the broke pieces (not too much damage) centering the battery and adding more nose weight to prevent immediate lift on take off.
I guess we will see later.
-B-
John Rudd:
--- Quote from: Krown Kustoms on November 06, 2009, 10:50:21 AM ---
I am centering the battery and adding more nose weight to prevent immediate lift on take off.
-B-
--- End quote ---
Rather than adding more weight, move the battery forward....and Delta wing style models( like yours) need a little reflex (Up elevon) to assist them getting away...Depending on your transmitter you program this in and switch it out once airorne
Seems like you had full uptrim on elevator when you launched it hence the loop...again Reflex...add about 1/8th inch from Neutral
I fly R/C planes too, so if I can help......
tinkerer:
If you can determine the mean chord of the wing, it is an easy task to adjust the cg for stable flight. The cg should be about 25% of the mean chord. It will (should) be forward of the main gear and aft of the wing leading edge at the fuselage.
sbwhart:
Hi Krown
No advice from me just congratulation on getting a flyer well done :clap: :clap: :clap: I can see you breaking the sound barrier.
Have fun and thanks for sharing
Stew
John Rudd:
To calc the MAC is fairly easy...
Measure tip and the root chord.
Now draw the following lines on a large sheet of paper...
At the root of the wing, draw a line parallel to the centreline of the fuzz extending forward from the leading edge and rearward from the trailing edge. These lines should be the length of the tip chord.
Do the same thing at the tip but draw the lines the length of the root chord.
Connect the ends of the lines so that they create an "X" over the wing panel. Where the two lines intersect is the spanwise location of the Mean Aerodynamic Chord.
My C-o-C sketch may help.....
http://i754.photobucket.com/albums/xx182/Chippiejnr/mac.gif
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